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Exposed internal FPA func_decl kinds. Added missing FPA simplifications. Fixes #1242.

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This commit is contained in:
Christoph M. Wintersteiger 2017-09-11 14:36:58 +01:00
parent d131aba8a9
commit e88487021a
5 changed files with 97 additions and 24 deletions
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28
src/ast/rewriter/fpa_rewriter.cpp
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@ -94,8 +94,8 @@ br_status fpa_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
case OP_FPA_TO_IEEE_BV: SASSERT(num_args == 1); st = mk_to_ieee_bv(f, args[0], result); break;
case OP_FPA_TO_REAL: SASSERT(num_args == 1); st = mk_to_real(args[0], result); break;
case OP_FPA_INTERNAL_MIN_I:
case OP_FPA_INTERNAL_MAX_I:
case OP_FPA_INTERNAL_MIN_I:SASSERT(num_args == 2); st = mk_min_i(f, args[0], args[1], result); break;
case OP_FPA_INTERNAL_MAX_I: SASSERT(num_args == 2); st = mk_max_i(f, args[0], args[1], result); break;
case OP_FPA_INTERNAL_MIN_UNSPECIFIED:
case OP_FPA_INTERNAL_MAX_UNSPECIFIED:
SASSERT(num_args == 2); st = BR_FAILED; break;
@ -454,6 +454,18 @@ br_status fpa_rewriter::mk_min(expr * arg1, expr * arg2, expr_ref & result) {
}
}
br_status fpa_rewriter::mk_min_i(func_decl * f, expr * arg1, expr * arg2, expr_ref & result) {
scoped_mpf v1(m_fm), v2(m_fm);
if (m_util.is_numeral(arg1, v1) && m_util.is_numeral(arg2, v2)) {
if (m_fm.is_zero(v1) && m_fm.is_zero(v2) && m_fm.sgn(v1) != m_fm.sgn(v2))
result = m().mk_app(get_fid(), OP_FPA_INTERNAL_MIN_UNSPECIFIED, arg1, arg2);
else
result = m_util.mk_min(arg1, arg2);
return BR_DONE;
}
return BR_FAILED;
}
br_status fpa_rewriter::mk_max(expr * arg1, expr * arg2, expr_ref & result) {
if (m_util.is_nan(arg1)) {
result = arg2;
@ -489,6 +501,18 @@ br_status fpa_rewriter::mk_max(expr * arg1, expr * arg2, expr_ref & result) {
}
}
br_status fpa_rewriter::mk_max_i(func_decl * f, expr * arg1, expr * arg2, expr_ref & result) {
scoped_mpf v1(m_fm), v2(m_fm);
if (m_util.is_numeral(arg1, v1) && m_util.is_numeral(arg2, v2)) {
if (m_fm.is_zero(v1) && m_fm.is_zero(v2) && m_fm.sgn(v1) != m_fm.sgn(v2))
result = m().mk_app(get_fid(), OP_FPA_INTERNAL_MIN_UNSPECIFIED, arg1, arg2);
else
result = m_util.mk_max(arg1, arg2);
return BR_DONE;
}
return BR_FAILED;
}
br_status fpa_rewriter::mk_fma(expr * arg1, expr * arg2, expr * arg3, expr * arg4, expr_ref & result) {
mpf_rounding_mode rm;
if (m_util.is_rm_numeral(arg1, rm)) {